Study of $\bar{B}_s^0 \to (D_s^+,D_s^{*+}) l^-\bar{\nu}_l$ decays in the pQCD factorization approach - INSPIRE

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Study of $\bar{B}_s^0 \to (D_s^+,D_s^{*+}) l^-\bar{\nu}_l$ decays in the pQCD factorization approach

Nov 20, 2013

10 pages

Published in:

Phys.Rev.D 89 (2014) 1, 014030

Published: Jan 28, 2014

e-Print:

1311.4965 [hep-ph]

DOI:

10.1103/PhysRevD.89.014030

View in:

ADS Abstract Service

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Abstract: (APS)

The

{\bar{B}}_{s}^{0} \to D_{s}^{(*) +} l^{-} {\bar{ν}}_{l}

semileptonic decays were calculated in the framework of the standard model by employing the perturbative QCD (pQCD) factorization approach. We defined four ratios of the branching ratios of the considered decays

R (D_{s}^{(*)})

and

R_{D_{s}}^{l, τ}

. From the numerical results and phenomenological analysis we found that (a) the pQCD predictions for the branching ratios

B r ({\bar{B}}_{s}^{0} \to D_{s}^{(*) +} l^{-} {\bar{ν}}_{l})

generally agree well with the previous theoretical predictions, (b) for the four ratios, the pQCD predictions are

R (D_{s}) = 0.392 \pm 0.022

,

R (D_{s}^{*}) = 0.302 \pm 0.011

,

R_{D_{s}}^{l} = 0.44 8_{- 0.041}^{+ 0.058}

, and

R_{D_{s}}^{τ} = 0.58 2_{- 0.045}^{+ 0.071}

, which show a very good

S U {(3)}_{F}

flavor symmetry with the corresponding ratios for

B \to D^{(*)} l^{-} {\bar{ν}}_{l}

decays, and (c) we strongly suggest the measurements of the new ratios

R (D_{s}^{(*)})

and

R_{D_{s}}^{l, τ}

in the forthcoming Super-B experiments.

Note:

14pages, 4 ps figures

13.20.He
12.38.Bx
14.40.Nd
quantum chromodynamics: perturbation theory
quantum chromodynamics: factorization
anti-B/s0: semileptonic decay
anti-B/s0: branching ratio
branching ratio: ratio
D/s+: production
D/s*(2110): production

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